Which method is considered acceptable for controlling corrosion in water systems?

pH control is an essential method for managing corrosion in water systems because the acidity or alkalinity of the water can significantly influence the rate of corrosion of pipes and other infrastructure. When the pH is too low (acidic), corrosive properties of the water increase, leading to the potential for damage to metal components over time. Conversely, when the pH is higher (alkaline), it can help form protective films on the surfaces of metals, reducing the risk of corrosion.

By adjusting and maintaining the pH within an optimal range, water operators can effectively mitigate corrosion-related issues, thereby prolonging the lifespan of the system's components and ensuring the integrity of the water supply. This practice is particularly important in systems with metals like iron and lead, which are more susceptible to corrosion under certain pH conditions.

Other methods listed, although they may help in broader water quality control or disinfection processes, do not specifically target corrosion as effectively as pH control does.